Centrifugal pump.



RU. JONES. GENTRIPUGAL PUMP. APPLIUATION FILED Nov. 2B, 190s.

' @96825 Patented vmay 10, 1910.

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Agill/1411,14

entre eine RICHARD O. JONES, 0F DAYTON, OHIO, ASSIGNOBJ, BY M'ESNE ASSIGNMENTS, lO THE COMPUTING SCALE COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHXO.

CENTRIFUGAL PUMP.

Specication ofLetters Patent.

Patented May it?, fil.

Application filed November 28, 1908. Serial No. 464,957.

T o all 'whom it muy concern:

Be it known that l, lituanien O. Jo'Nns, a citizen oll the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in- Centrifugal lunips, of which the following is a full. clear, and exact description.

This invention relates to centrifugal pumps of the single stage type, and one of the principal objects is to provide a pump of high eiliciency capable of `running at high speed and on low lift-s or pressures.

In general terms the invention comprises a plurality of iinpellers` mounted upon a common impeller shaft and having a common volute discharge passage, the Atotal water capacity being divided up among` the various iinpellers so as to get large ca pacity and at the saine time keep the impeller diameters small. As the lift to which the water may bedelivered depends upon the outside diameter of the impellers, it is mani- `test that the inipellers must be very small in diameter' when it is desired to run them on low lifts and at high speeds. The high speed is an in'iportant consideration because of the increase in pump elliciency which re'- sults therefrom and likewise from the increased eiiieiency of the motive power when a steam turbine is used as such ay driving means. The inlet or inside diainelerfoi the impeller is governed by the quantity o'l water passing into the impeller at a proper velocity. rlliere'iere, by dividing the water up int-o the various intake openings ot' a plurality of impellers, this total intake capacity 1s multiplied whereas the inlet diameter` of each impeller is kept small and therefore with outside diameter compara.- tively small.

lVith the above mentioned objects in view. and with the further desiderata of seenring a construction' having the advantages of simplicity, conlpactness, econonrv and accessibility, the present invention comprises the combination of mechanisms hereinafter setforth and a preferred form of embodiment of which is shown in the attached drawings forming part of the specification.

Of said drawings, Figure l represents a vertical cross section. through the pump containing these improvements; and Fig. 2 represents a detailedview of one of the diffu sion rings.

Upon the transverse revoluhle shaft 2O are mounted two double impellers 2l and The impeller 2, on the left of Fig. l, is formed with two intake openings on opposite sides thereof, namely, 23 and 241; likewise the right hand impeller is of the double type having two opposite intake openin s and 2G. Both these impellers are suitably keyed or otherwise fastened to the shaft 2() so as to revolve therewith, and the iinpellers are of substantially the saine size .and construction.

The water to be delivered to the pump comes in through the main suction pipe '39 and divides through the Y pipes 3l and The suction pipe 8l leads to the suction head on the left hand side of the cylinder easing, this suction head surrounding the left hand impeller 2l so as to deliver water tol its ontside'intake opening-23. Similarly, the suction pipe 32 on the right, delivers water to the suction head 3l which surrounds and delivers water to the outside intake opening of the right hand inipeller 22.

Surrounding the iinpeller 21 is a dill'usion ring 41 and surrounding the impeller 22 is the diffusion ring42. These ditlusion rings are formed with the usual diil`usion vanes l?, carried spil-ally around the diiiusion ring troni the iinpeller periphery to the, outer pe,- riphery of the. lill3`usion ring so as lo 'lorm water passages List therebetween trom inner to outer periphery (see Fig. 2). These dill fusion r'ings 4l and 42 are bent laterally so as to converge from the twoseparated im pellers toward a common discharge periphery as at 45. Surrounding this common periphery of the diffusion rings is the volute easing 50, which as usual is substantially circular in cross section but increases in diameter from its lsmallest or contracted por tion to its largest portion where thewater is discharged into the main discharge pipe.

ln order to conduct the suction water lo the inside intake openings 24 and 26 of said ini the water is simultaneously delivered to both the intake openings of both impellers.

It will be seen .from Fig. 1 that the 1mpeller casings unite between the two impellers and forman intermediate common wall' or partition, thereby forming a separating wall between the transversely cored pas'- sages or openings at their central appreach to the said interior lor inside intake openings 24 and'26 of the impellers. Y

The arrows on F ig. l show the direction of thev water iiow as follows z-from the main suction pipe throu h and 32 into the suction eads on o posite sides of the cylinder and thus into the outside intake openings 23 and 25 of the two impellers. Then at the same time this suction water iiows through the water channels 60 formed in the diusion rings and thence supplies the inside intake openings 24 and 26. The water thus being taken lin from both sides of both impellers, flows through the water passages 44 of the diffusion rings to join at the common periphery thereof and be discharged into the volute casing 50 .which it traverses circularly in the usual manner and is then discharged from the pump.

It has heretofore been suggested to use what practically amounts to two separate and distinct centrifugal pumps having a common operating shaft, with each separate pump complete in itself with its own volute casing, but having a common suction supply for the two separrte pumps. The present invention, however, relates to an entirely different form of construction in which the suction pipes deliver water individually to the various inlets or intake openings of the .plurality of impellers and then there is but single volute casing common to and connected with these'irnpellers. In the present form, in which two double impellers are shown side by side, the suction water is first divided into two equal parts,oneh alf going to each side of 'the pump. lVhen each half of the water reaches its respective suction head it is again divided into two equal parts thus supplying each side of each impeller with one-fourth of the total capacity of the p ump. There being two separate diffusion ring castings one-fourth of the total quantity CTS of water passes transversely through the holescored into the diHusion ring castings. Thus the suction water passes through the diffusion rings at right angles to the dis charge water which is coniined within the water. passages formed by the diffusion vanes.

It .will be noted that this construction is not that of la series pump, eventhough itv has a` series of impellers mounted on the same shaft, for both impellers deliver Water against the saine lift or head. The result of the construction is that since the total Water the Y pipes 31l capacity is divided up into four parts, each side of eachA of the double impellers taking one-fourth of the total capacity, the inside diameters of the impellers can thereby be kept small. This enables the outside impeller diameter to be corres ondingly small so that the impellers may lbsrun at high speed a ainst a low lift with large capacity and hig eiiciency.

It is to be understood that the form of said double impellers; and a single discharge casing common toA and connected with said impellers.

2. In a centrifugal pump, the combination with a plurality of double impellers mountedupon a common impeller shaft and revoluble therewith, of suction pipes and water passages for conducting water to all the intake openings on the opposite sides of said double impellers; a diffusion ring surrounding each of said double impellers and all converging to a common discharge periphery; and a single discharge casing common to and surrounding said diusion rings at their common discharge periphery, and serving as a common discharge for all said impellers.

3. In a centrifugal pump, the combination with a cylinder casing inclosing two v double impellers mounted side by side upon a common impeller shaft and revoluble therewith, of double suction pipes leading to suction heads on opposite sides of the cylinder casing, said pipes connecting with the outside intake openings of said impellers; water channels leading through said cylinder casing from the outside suction heads to the respective inside intake openings of said impellers; and a single discharge casing common to and connected with said impel- 1ers.

4. In a centrifugal pump, the combination with a cylinder casing inclosing two double impellers mounted side by side upon a common impeller shaft and revoluble therewith, of double suction pipes leading to suction heads on opposite sides of the cylinder casing, said p ipes connecting with the outside intake openings of said impellers; a

diifusion ring for each of said' impellers both converging to a common discharge periphery; water channels leading from said outside suction heads through seid diffusion rings to the respectivo inside intake openings of said impeilers; and a single volute easingcomnion to and surronndino said diffusion rings at their common disarge periphery, said. volute serving as a Icommon discharge 'for both said impellers.

5, In a certrifu a1 pump, the combination with a pair 0% double closed im ellers mounted on u revoluble irnpeiler sha t, und a suction pi e and head connected With the outside inta e opening of each of said iineilers; of a casing surrounding` each of said impellers and having suction passages cored transversely therethrough to connect with the interior intakes on the opposite sides of the impeliers; said ixnpeller casings uniting between the two impellers in an intermediate common partition forming a separating wall between said transversely cored pas .sages at their central approach to said interior intakes.-

n testimony whereof I, afiix my signature in the presence of two subscribing witnesses.

, RICHARD O. 'J ONES. Witnesses:

W. A. CLAnE, J. B. HAYWARD. 

